东北大学学报(自然科学版) ›› 2023, Vol. 44 ›› Issue (10): 1392-1400.DOI: 10.12068/j.issn.1005-3026.2023.10.004

• 信息与控制 • 上一篇    下一篇

自适应调节医学CT序列图像窗宽窗位算法

陈锦林, 原培新, 侯浩南, 赵钊   

  1. (东北大学 机械工程与自动化学院, 辽宁 沈阳110819)
  • 发布日期:2023-10-27
  • 通讯作者: 陈锦林
  • 作者简介:陈锦林(1997-),男,福建泉州人,东北大学硕士研究生; 原培新(1953-),男,辽宁营口人,东北大学教授.
  • 基金资助:
    -

Self-adaptation Adjusting Window Width and Window Level Algorithm for Medical CT Sequence Images

CHEN Jin-lin, YUAN Pei-xin, HOU Hao-nan, ZHAO Zhao   

  1. School of Mechanical Engineering & Automation, Northeastern University, Shenyang 110819, China.
  • Published:2023-10-27
  • Contact: YUAN Pei-xin
  • About author:-
  • Supported by:
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摘要: 调窗处理能够提高医学CT图像对灰度的识别准确率,默认窗位窗宽(127.5, 255)局限性强,人工调窗不仅需要具备丰富的先验知识,而且效率低下无法广泛应用,为此提出一种自适应调窗算法.该算法首先根据序列图像最大和最小灰度值绘制直方图.其次设置相关参数,遍历直方图去除频数小于阈值T0的部分,再次遍历直方图将相邻两组频数差值小于阈值T1的部分合并.最后根据直方图计算窗宽窗位.通过对比实验表明,该算法在均方误差、信噪比和峰值信噪比方面都有所提高,能够有效地提高灰度识别准确率.

关键词: 医学CT序列图像; 自适应;调窗处理;直方图;阈值

Abstract: Window transformation can improve the accuracy of gray level recognition in medical CT images. The default window(127.5, 255)has strong limitations. Manual window transformation requires rich priori knowledge and is inefficient, making it unsuitable for widespread use. Therefore, a self-adaptation algorithm for window transformation in medical CT sequence images is proposed. Firstly, a histogram is drawn according to the maximum and minimum gray level values of the sequence images. Secondly, relevant parameters are set to traverse the histogram to remove parts with frequencies below the threshold T0. After traversing the histogram again, parts with a difference between adjacent groups of frequencies less than the threshold T1 are merged. Finally, the window width and window level are calculated based on the histogram. Experimental results showed that the algorithm improved the mean square error, signal-to-noise ratio and peak signal-to-noise ratio, which could effectively improve the accuracy of gray level recognition.

Key words: medical CT sequence images; self-adaptation; window transformation; histogram; threshold

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